A and T Labs
K6 Audio Power Amplifier Assembly Manual
2001 A and T Labs Inc.
AMK6a
17
Following is a checklist for the chassis mounted components:
5.1 Chassis Mounted Components
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Description
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Description
4 output terminals
Mount panel LEDs (power supply and 5 ¼” amp clip
and overload)
IEC power input connector
Fans (3 ½” unit)
Power switch
Once all boards have been tested, install them along with their heat sinks in the
chassis. Use heat sink grease between the L-bracket and the heat sink. The power
supply is installed first in both the 3 ½” and 5 ¼” units. Wiring will need to be installed on
the power supply before the amplifier boards are installed. Measure, cut, and strip
wires to appropriate lengths to reach the corresponding amplifier terminals. Following is
a checklist for inter module and other unit wiring:
5.2 Wiring
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Description
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Description
IEC AC power connector to power switch
Ground to each amp
Power switch to power supply
Output from binding post to each amp
Fans to 12V power on power supply
Output ground from binding post to each amp
Power supply voltage select switch
(switch installation)
Power supply power and shutdown LEDs/wires
12 volt relay power to each amp
Amp clip and overload LEDs/wires (5 ¼” unit)
+Vcc to each amp
Bridging coax from input channel to other
channel (If used)
-Vcc to each amp
Carefully re-check work and perform final testing: Install fuses in power supply and one
amplifier. Apply power and check that no DC appears at the amplifier output terminals.
Apply a signal and load and check for proper amplifier operation. Test the other
channel the same way.
6. OPERATING HINTS
The only special operating instruction pertains to the use of the inverter voltage select
switch. In general, lower voltages can be used for two purpose: First, to limit the power
available to sensitive loads. Some audiophiles, for example like to limit the available
power to near 100 watts into an 8 ohm load. For that kind of operation, choose the 58
volt setting. Second, when driving low impedance speakers, such as 1-4 ohms, the
power dissipation in the amplifier may be limited by setting the voltage to 41 volts. In
